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Desktop apps
Outline
Minicons
Alert, White, warning
Black
512x512
warning, Alert, Dialog
Network & communications
Glyph
Communication & Technology
wave, Attention, Error
Files & folders
Flat
small-n-flat
Error, sign
Tomato
Error, shield
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UI
Windows 8 metro style
Error
DarkSlateGray
Freecns Cumulus
warning, Error, Attention
mark, exclamation, Error
Halloween
Photorealistic
Desktop Halloween
user, kill, Caution
256x256
Mixed
Smooth
Tango Icon Library
Error, Dialog
Error, network
DimGray
printer, Error
Photography & graphic design
3D
32x32 Free Design Icons
Crimson
32x32
Business & finance
48x48 Free Time Icons
Abort, exclamation, Up
48x48
PNG MORE
24x24 Free Application Icons
24x24
stop, Abort, Block
Attack, Error, Alert
Error, sign, Blocked
Red
Pixel
16x16 Free Application Icons
prohibition, danger, reject
Firebrick
16x16
danger, wind, Gesture
Salmon
Iconza
Signs & symbols
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
64x64
warning, danger, Alert
